Hello Nitesh,
The drag and drop operation is only performed if
AllowDragDrop property is set to true, please try putting a breakpoint in your application and check the state of the
AllowDragDrop property. For more information please take a look at this
help article.
Or please test the following example and let me know if you are noticing similar behavior:
Hope this helps, if you have any other questions or comments, please let me know,
Best Regards,
Emanuel Varga